To evaluate the aquatic ecosystem's quality and ensure the sustainable management of fisheries, it is important to monitor fish populations. Hydroacoustics uses sound waves to noninvasively scan and gather information on waterbodies including fish abundance and distribution. Unmanned surface vehicles (USV) have been increasingly used in marine and freshwater environments to enable data collection. We provide a detailed description of a new USV called Hydroacoustic Autonomous boat for Remote fish detection in LakE (HARLE), which is devoted to hydroacoustic studies in freshwater. The USV is electrically powered and equipped with the most modern fishery scientific echosounder, suitable for broadband applications, the EK80 (SIMRAD). The USV was used for a conventional hydroacoustic survey in a peri‐alpine lake to investigate its potential to monitor fish populations in lakes. In the lower layer of the lake where there were numerous targets and comparisons were possible, hydroacoustic metrics and fish biomass values (kg ha⁻¹) from the SIMRAD EK80 on board the USV and EK60 on board the research vessel were similar. We showed that the HARLE has great potential to be used as a tool for fish monitoring and hydroacoustic survey in freshwater.

中文翻译：

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用于在LakE（HARLE）中进行远程鱼类检测的水声自动船，这是一种无人驾驶的自动水面工具，用于监测湖泊中的鱼类种群

为了评估水生生态系统的质量并确保渔业的可持续管理，重要的是监测鱼类种群。水声声学利用声波非侵入性地扫描和收集有关水体的信息，包括鱼类的丰度和分布。无人水面载具（USV）已越来越多地用于海洋和淡水环境中以实现数据收集。我们提供了一种新的名为“水声自动船”的USV的详细描述，该船用于LakE（HARLE）中的远程鱼探测，该船专门用于淡水中的水声研究。USV是电动的，并配备了最现代的渔业科学回声测深仪，适用于宽带应用，即EK80（SIMRAD）。USV用于在高寒湖泊中进行常规水声调查，以研究其监测湖泊鱼类种群的潜力。在湖泊的下层，那里有许多目标，可以进行比较，水声指标和鱼类生物量值（kg ha^-1）与USV上的SIMRAD EK80和研究船上的EK60相似。我们证明了HARLE具有很大的潜力，可以用作淡水鱼监测和水声调查的工具。